Persamaan garis melalui titik (1,2) dan (-3,4) adalah

Kelas 8 Matematika
Bab Persamaan Garis

(y - y1)/(y2 - y1) = (x - x1)/(x - x1)
(y - 2)/(4 - 2) = (x - 1)/(-3 - 1)
(y - 2)/2 = (x - 1)/(-4)

✩✩ (-4) : 2 = (-2) ✩✩

(-2) . (y - 2) = x - 1
-2y + 4 = x - 1
x + 2y = 4 + 1
x + 2y = 5

y - y1 ..... x - x1
--------- = --------
y2 - y1 .. x2 - x1

y - 2 .. x - 1
------ = ------
4 - 2 .. -3 - 1

y - 2 .. x - 1
------ = ------
2 ......... -4

4 ( y - 2 ) = 2 ( x - 1 )
4y - 8 = 2x - 2
4y - 2x = 6
2y - x = 3
-x + 2y = 3